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Old 08-16-2017, 06:55 AM   #1
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Default 2 x 1.8 piston usage?

Anyone here try 2 x 1.8 pistons on 1/10 2wd buggy for extremely rough conditions with very little jumps that you can downside?
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Old 08-22-2017, 07:36 PM   #2
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Anyone here try 2 x 1.8 pistons on 1/10 2wd buggy for extremely rough conditions with very little jumps that you can downside?
I have actually never tried 2 x 1.8 . However on my carpet buggies i have had better handling with 3 x 1.4 so smaller holes and more of them seems to be the direction I am headed on high traction .
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Old 08-23-2017, 04:13 AM   #3
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Funny that you ask because I just put a set of 2x1.8 on the back of my wheeler last Friday and the car felt great. I had no more choices on pistons and the only thing I had was a piston with just one hole of 1.8. it happened that I had a 1.8mm drill bit and said "hell, why no?t". So, I am running 2x1.6 in the front and 2x1.8 rear with AE white springs front and AE green springs rear, 30wt front 25wt rear oils in my PRSB401 and the car was really good on an outdoor rough-ish really dusty with medium/larger-ish jumps... Only thing I didn't do because I was running three classes and didn't have enough time was to change the center diff oil (thinner). But Ill do that at home before next race.
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Old 08-23-2017, 05:44 AM   #4
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Interested in this as I am currently running 1.7x2 rear and 1.6x2 at the front and due to the main straight rutting i require less pack. Was thinking of trying 1.5x3.
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Old 08-23-2017, 07:13 AM   #5
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thanks for the info JR Slash! I was wondering if I was just crazy lol. I may play with this. Do you feel you should go up in shock oil weight over the 1.7 configuration? I was thinking going with the piston change on rear, but doing 50cst heavier.
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Old 08-23-2017, 07:45 AM   #6
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I used to run this and even 2x1.9 at SCRC where it was high grip and super bumpy. It took the pack out so the car felt dead over the high speed bumps instead of getting out of shape.
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Old 08-23-2017, 10:18 AM   #7
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good stuff. I am thinking I may give that a go at the next race on Monday. Heck, its only pistons anyway lol.

Any advise on oil selection going from 1.7s to 1.8s? Does my idea of 50cst increase when doing the swap make sense or should I stick with the same weight? Right now can't really do any changes at the track during race day as its goes quite fast.
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Old 08-23-2017, 10:56 AM   #8
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Quote:
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good stuff. I am thinking I may give that a go at the next race on Monday. Heck, its only pistons anyway lol.

Any advise on oil selection going from 1.7s to 1.8s? Does my idea of 50cst increase when doing the swap make sense or should I stick with the same weight? Right now can't really do any changes at the track during race day as its goes quite fast.
Dividing the car by the area of the holes gives you a rough idea.


1.7 x 2 gives the following:
27.5 313 68.92
30 350 77.00
32.5 388 85.44
35 425 93.

1.8 x 2 gives
27.5 313 61.48
30 350 68.74
32.5 388 76.21
35 425 83.

So going up 2.5wt or 35car should bring you back into a similar ball park. So your idea of 50cst should be about right.
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Old 08-23-2017, 11:37 AM   #9
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Great, I'll use this in combo with the below.

mm..........2.......3......4.......5.......6..
1.0......1.571 2.356 3.142 3.927 4.712
1.1......1.901 2.851 3.801 4.752 5.702
1.2......2.262 3.393 4.524 5.655 6.786
1.3......2.655 3.982 5.309 6.637 7.964
1.4......3.079 4.618 6.158 7.697 9.236
1.5......3.534 5.301 7.069 8.836
1.6......4.021 6.032 8.042
1.7......4.540 6.809
1.8......5.089 7.634
1.9......5.671 8.506
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Old 08-23-2017, 03:22 PM   #10
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The next step is to divide oil cst by total area of piston. For instance, 2 x 1.8 = 5.09. 30 wt oil is about 350 cst depending on brand (I use AE). 350 / 5.09 = static damping of 68.81. This is close to what I run on my xray xb4 in the rear but with 4 hole pistons. 2 x 1.1 + 2 x 1.5 = 5.43. I use 32.5 or 388 cst. This = 71.43 static damping.
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